<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <input type="text" id="input" />
    <script>
      const input = document.getElementById("input");
      input.onkeydown = function (e) {
        if (e.key <= "z" && e.key >= "a") {
          e.preventDefault();
        }
      };
    </script>
  </body>
</html>
